Penis is not erecting fully

Patient

Q:I am nineteen and I masturbate for more than 8 years regularly sometimes 3-4 times a day.I don't know that foreskin of the penis should retract while erection. My foreskin does not retract and my penis does not raise fully it raises not even to half its bent downwards.When I try to pull back the foreskin the head of my penis curves down a lot . I didn't notice that whether it was OK in my small age. What's the problem can I cure without any surgery. Please help me. Thanks in advance.

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